GO curators for mouse genes have assigned the following annotations to the gene product of Wt1. (This text reflects annotations as of Tuesday, May 26, 2015.) Summary from NCBI RefSeq

This gene encodes a transcription factor that contains four zinc-finger motifs at the C-terminus and a proline/glutamine-rich DNA-binding domain at the N-terminus. It plays an essential role in the normal development of the urogenital system, and the orthologous human gene is mutated in a small subset of patients with Wilm's tumors. Alternative splicing has been noted for this gene, however, the full-length nature of these variants is not known. The mRNA for this gene has been shown to initiate translation from non-AUG (CUG) and AUG translation start sites, resulting in different isoforms. [provided by RefSeq, Apr 2013]Summary text based on GO annotations supported by experimental evidence in mouse

Researchers have inferred from direct assay, that the gene product of Wt1